The Morrison book concentrates on the
origins of the St Clair/Sincler/Sinclair name and family in France, with
much coverage of the immigrants of this name from Scotland in the 17 &
1800's to the U. S. There are references to "Sinclairs in
England" but these are primarily in connection with William and the
Norman Invasion of 1066.

THe Sinclairs of England book has no author
listed, which seems most unusual, but I'll bet Niven or someone with his
background in this subject knows who wrote it. It was published in
London by Trubner & Co, Ludgate Hill in 1887. and the copy I have was a
product of Ballantine Press, of London and Ediburgh. It's a hard copy,
and in very good condition. When I have more serious time at my
disposal, I will go through your message and see what I can find that might
be helpful, then I will post the results on the Sinclair net for all to
share. Hope to do this in the next week, so keep tuned
in.

With the arrival of "Sinclair"
warriors from Normandy in 1066, I believe none could be called
"Scots". This begs the question "Did those who came to
Wales became "Welsh Sinclairs?" Etc, etc. We'll get to
the bottom of this eventually, but mainly I just hope to see your question
answered, and that's really worth the effort, right!